/**
    * This file Copyright (c) 2011-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.ui.vaadin.gwt.client.widget.controlbar;
  
  import info.magnolia.ui.vaadin.gwt.client.widget.controlbar.eventmanager.ControlBarEventHandler;
  import info.magnolia.ui.vaadin.gwt.client.widget.controlbar.eventmanager.ControlBarEventManager;
  import info.magnolia.ui.vaadin.gwt.client.widget.controlbar.listener.ComponentListener;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.dom.client.Element;
  import com.google.gwt.dom.client.NativeEvent;
  import com.google.gwt.dom.client.Style;
  import com.google.gwt.event.dom.client.DragDropEventBase;
  import com.google.gwt.user.client.ui.Label;
  
  /**
   * Control bar for components. Injected at the beginning of a component.
   */
  public class ComponentBar extends AbstractBar<ComponentListener> {
  
      private static final String MOVE_ICON_CLASS_NAME = "icon-move";
      private static final String MOVE_SOURCE_CLASS_NAME = "moveSource";
      private static final String MOVE_TARGET_CLASS_NAME = "moveTarget";
      private static final String MOVE_OVER_CLASS_NAME = "moveOver";
  
      private ControlBarEventManager eventManager = GWT.create(ControlBarEventManager.class);
      private boolean movable;
  
      protected ComponentBar() {
          addStyleName(COMPONENT_CLASS_NAME);
      }
  
      public void setDraggable(boolean draggable) {
          if (DragDropEventBase.isSupported()) {
              if (draggable) {
                  this.getElement().setDraggable(Element.DRAGGABLE_TRUE);
                  getElement().getStyle().setCursor(Style.Cursor.MOVE);
              } else {
                  this.getElement().setDraggable(Element.DRAGGABLE_FALSE);
                  getElement().getStyle().setCursor(Style.Cursor.DEFAULT);
              }
          }
      }
  
      @Override
      protected void createControls() {
          super.createControls();
          if (movable) {
              final Label move = new Label();
              move.setStyleName(ICON_CLASS_NAME);
              move.addStyleName(MOVE_ICON_CLASS_NAME);
              eventManager.addClickOrTouchHandler(move, new ControlBarEventHandler() {
                  @Override
                  public void handle(NativeEvent event) {
                      listener.onMoveStart(false);
                  }
              });
              addButton(move);
          }
      }
  
  
  
      private void registerDragStartHandler() {
          eventManager.addDragStartHandler(this, new ControlBarEventHandler() {
              @Override
              public void handle(NativeEvent event) {
                  event.getDataTransfer().setData("text", "dummyPayload");
                 event.getDataTransfer().setDragImage(getElement(), 10, 10);
                 listener.onMoveStart(true);
             }
         });
 
         eventManager.addDragEndHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 listener.onMoveCancel();
             }
         });
     }
 
     public void registerDragAndDropHandlers() {
         eventManager.addDragOverHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 setMoveOver(true);
                 event.stopPropagation();
             }
         });
 
 
         eventManager.addDragLeaveHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 setMoveOver(false);
                 event.stopPropagation();
             }
         });
 
         eventManager.addDropHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 listener.onMoveStop();
                 event.preventDefault();
             }
         });
     }
 
     public void unregisterDragAndDropHandlers() {
         eventManager.unregisterDnDHandlers(this);
     }
 
     public void registerMoveHandlers() {
         eventManager.addMouseDownHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 listener.onMoveStop();
             }
         });
 
         eventManager.addMouseOverHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 setMoveOver(true);
             }
         });
 
         eventManager.addMouseOutHandler(this, new ControlBarEventHandler() {
             @Override
             public void handle(NativeEvent event) {
                 setMoveOver(false);
             }
         });
     }
 
     public void unregisterMoveHandlers() {
         eventManager.unregisterMoveHandlers(this);
     }
 
     public void setMoveTarget(boolean target) {
         setStyleName(MOVE_TARGET_CLASS_NAME, target);
     }
 
     public void setMoveOver(boolean over) {
         setStyleName(MOVE_OVER_CLASS_NAME, over);
     }
 
     public void setMoveSource(boolean source) {
         setStyleName(MOVE_SOURCE_CLASS_NAME, source);
     }
 
     /**
      * Builder for the component-bar widget.
      */
     public static class Builder extends AbstractBar.Builder<Builder, ComponentBar, ComponentListener> {
 
         private boolean isMovable;
         private boolean edit;
 
         public Builder withMovable(boolean movable) {
             this.isMovable = movable;
             return this;
         }
 
         public Builder withEdit(boolean edit) {
             this.edit = edit;
             return this;
         }
 
         public ComponentBar build() {
             ComponentBar componentBar = super.build(GWT.create(ComponentBar.class));
             componentBar.editable = edit;
             componentBar.movable = isMovable;
             componentBar.createControls();
             componentBar.addIcons();
 
             if (isMovable && DragDropEventBase.isSupported()) {
                 componentBar.registerDragStartHandler();
                 componentBar.setDraggable(true);
             }
 
             return componentBar;
         }
     }
 }